Question

1. Of the following groups of three, the elements whose properties are

most nearly alike are those having atomic numbers
A) 1, 2, and 3
B) 5, 13, 31
C) 5, 6, and 7
D) 3, 11, and 19
2. Which set of elements is listed in order of increasing metallic
reactivity?
A)Cu, Na, Pb, Sn
B) Sr. Ca, Mg, Be
C) K, Sc, V. Sn
D) B, Al, Ga, In
3. In the periodic table, elements known as metals are
A) in one row
B) in one column
C) on the left side
D) on the right side
4. Of the elements listed below, which element will have the most
vigorous reaction with water?
A) sodium, Na
B) magnesium, Mg
C) potassium, K
D) cesium, Cs

Answer 1

The elements with the most alike properties are those in the same group, with Group 1's alkali metals, lithium (Li), sodium (Na), and potassium (K), being the most alike. The increasing order of metallic reactivity is Sr, Ca, Mg, Be, and metals are located on the left side of the periodic table. Cesium (Cs) is the most reactive with water among the given options.

Step-by-step explanation:

Understanding the Periodic Table and Element Reactivity

1. The elements with most nearly alike properties are those in the same group of the periodic table, which possess similar chemical properties due to their similar valence electron configurations. Out of the given options, D) 3, 11, and 19 represent elements (Lithium, Sodium, Potassium) which all belong to the alkali metals group, known for similar properties and reactivity patterns.

2. The set of elements listed in order of increasing metallic reactivity are those in B) Sr, Ca, Mg, Be. Reactivity increases down the group in the periodic table for alkali and alkaline earth metals, which means strontium (Sr) is more reactive than calcium (Ca), and so on.

3. Metals in the periodic table are generally located on the left side of the table. They exhibit typical metallic properties, such as conductivity and a tendency to lose electrons during chemical reactions.

4. When considering reactivity with water, cesium (Cs), represented by D) cesium, Cs, will have the most vigorous reaction, as reactivity increases down the group 1 which is comprised of the alkali metals.

Answer 2

Step-by-step explanation:

1. D

2. B

3. C

4. A